<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>HTML基础</title>
</head>
<body>
<input type="text">
<input type="hidden">
<input type="password">
<input type="file">
<input type="button">

<form name="form1">
    a:<input type="checkbox" name="checkit" value="a" checked><br>
    b:<input type="checkbox" name="checkit" value="b"><br>
    c:<input type="checkbox" name="checkit" value="c"><br>
</form>

</body>
</html>